John Ciardi got his master’s degree from the University of Michigan in 1939 and

游客2023-12-25  18

问题 John Ciardi got his master’s degree from the University of Michigan in 1939 and has published more than 40 poems.  [br]  
John Ciardi was born in 1916 in Boston, Massachusetts, the child of Italian immigrants. He attended Bates College and Tufts College and received his master’s degree from the University of Michigan in 1939. He is the author of more than forty volumes of poetry.
Most NASA spacecraft rely on some form of chemical propellant to push themselves through space. But at the Marshall-based center, researchers are studying a range of future propulsion methods, including propellant-less systems, simulated fission engines that could one-day lead to the real thing and the basic technologies necessary for future antimatter drives.

选项 A、正确
B、错误

答案 A

解析 该段主要讨论宇宙飞船的动力系统。根据原文我们知道如今大部分飞船靠化学物质作为动力,但如今研究者们正在研制一系列的未来动力措施。由此可推测,未来飞船不会使用化学物质作为动力。因此,该题的说法是正确的。
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